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diff --git a/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
--- a/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
@@ -56,7 +56,7 @@
$refs = array();
foreach ($ref_map as $ref => $commit) {
$refs[] = id(new DiffusionRepositoryRef())
- ->setShortName($ref)
+ ->setShortName((string)$ref)
->setCommitIdentifier($commit);
}
} else {
diff --git a/src/applications/diffusion/data/DiffusionGitBranch.php b/src/applications/diffusion/data/DiffusionGitBranch.php
--- a/src/applications/diffusion/data/DiffusionGitBranch.php
+++ b/src/applications/diffusion/data/DiffusionGitBranch.php
@@ -101,7 +101,9 @@
if ($branch == '(no branch)') {
continue;
}
-
+ // Note: If the $branch name string is numeric containing only decimal
+ // ints and does not start with 0, PHP will cast it from string to int:
+ // https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
$map[$branch] = $branch_head;
}
diff --git a/src/docs/flavor/php_pitfalls.diviner b/src/docs/flavor/php_pitfalls.diviner
--- a/src/docs/flavor/php_pitfalls.diviner
+++ b/src/docs/flavor/php_pitfalls.diviner
@@ -374,3 +374,25 @@
// ...
}
```
+
+= PHP casts all-digit array keys from string to int =
+
+An array key which is a string that contains a decimal int will be cast to the
+int type:
+
+```lang=php
+$key0 = "main";
+$key1 = "123";
+$key2 = "0123";
+$array = array($key0 => "foo", $key1 => "foo", $key2 => "foo");
+foreach ($array as $key => $value) {
+ print(gettype($key)."\n");
+}
+```
+prints `string`, `integer`, `string`.
+
+Thus running `phutil_nonempty_string($key)` complains that it expected null or
+a string but got int.
+
+Avoid this by either explicitly casting via `(string)$key`, or by using
+`phutil_nonempty_scalar($key)` instead of `phutil_nonempty_string($key)`.

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Content licensed under Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA) unless otherwise noted; code licensed under Apache 2.0 or other open source licenses. · CC BY-SA 4.0 · Apache 2.0